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30 results for “invader impact”
Fig. 4 in Population counts and potential impact of two successful invaders in a town of Northern Italy: the case of ring-necked parakeet and Alexandrine parakeet in Reggio Emilia
Fig. 4 - One of the four Savi's pipistrelles killed by RNPs in Reggio Emilia. / Uno dei quattro pipistrelli di Savi uccisi da parrocchetti dal collare a Reggio Emilia.
Fig. 3 in Population counts and potential impact of two successful invaders in a town of Northern Italy: the case of ring-necked parakeet and Alexandrine parakeet in Reggio Emilia
Fig. 3 - Mean consumption (and standard deviations) of persimmons by RNPs, APs and AP×RNP hybrids in 2019 and 2020. / Consumo medio percentuale (e deviazione standard) di cachi per pianta da parte di parrocchetti dal collare, parrocchetti di Alessandro e ibridi nel 2019 e nel 2020.
Fig. 1 in Population counts and potential impact of two successful invaders in a town of Northern Italy: the case of ring-necked parakeet and Alexandrine parakeet in Reggio Emilia
Fig. 1 - Male individuals of ring-necked parakeet (left) and Alexandrine parakeet (right) in Reggio Emilia. / Individui di sesso maschile di parrocchetto dal collare (sinistra) e parrocchetto di Alessandro (destra) a Reggio Emilia. (Photo: / Foto: S. Manfredini).
Fig. 2 in Population counts and potential impact of two successful invaders in a town of Northern Italy: the case of ring-necked parakeet and Alexandrine parakeet in Reggio Emilia
Fig. 2 - Population counts at night roosts showing the growing trends of both RNPs and APs in Reggio Emilia. Counts recorded during our 2019-2020 survey are shown in a blue rectangle. The 2008-2018 counts were obtained from the literature and citizen-science web platforms (Chessa, 2020). / Conteggi di parrocchetti ai dormitori notturni, con tendenze crescenti sia di parrocchetto dal collare sia di parrocchetto di Alessandro a Reggio Emilia. I conteggi del 2019-2020 sono riportate nel rettangolo blu. I conteggi 2008-2018 sono stati ottenuti da letteratura e da piattaforme web di citizen-science (Chessa, 2020).
Data from: Phenological mismatches mitigate the ecological impact of a biological invader on amphibian communities
<p>Data and code for the manuscript entitled "Phenological mismatches mitigate the ecological impact of a biological invader on amphibian communities" for Ecological Applications (2024). <br><br><br><br>The raw sequencing data was submitted to NCBI’s Sequence Read Archive (SRA) under BioProject number PRJNA1023717 (https://dataview.ncbi.nlm.nih.gov/object/PRJNA1023717?reviewer=rciv7kme2qq5vpcnqqog4vjioo). </p>
Are rice fields less diverse and more invaded by non-native species than less impacted habitats? A test with wetland microcrustaceans
<p>Raw data of environmental variables and microcrustacean abundance community matrix</p> <p>R scripts used in the study</p>
Data from: Live fast, die young: Life history traits of an apex predator exacerbate the ecological impact of a toxic invader
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A trait-based approach across the native and invaded range to understand plant invasiveness and community impact
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Data from: Unraveling the ecological and evolutionary impacts of a plant invader on the pollination of a native plant
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Data from: Differing impacts of two major plant invaders on urban plant-dwelling spiders (Araneae) during flowering season
<p>The dataset contains spider (Araneae) specimen numbers collected from flowering invasive American goldenrod (<em>Solidago canadensis/gigantea</em>) and invasive Himalayan balsam (<em>Impatiens glandulifera</em>) stands occuring naturally in urban areas of the city of Karlsruhe, Germany. Corresponding plots with native ruderalized vegetation in direct vicinity of each invaded plot were used as a comparison plot, resulting in a fully paired design for each plant invader study. An additional column represents potential non-araneae prey items collected together with the spiders from each stand. Spider specimens were determined to the family level as well as classified into web builders and hunters without a web.</p>
Data from: Linking niche theory to ecological impacts of successful invaders: insights from resource fluctuation-specialist herbivore interactions
1. Theories of species coexistence and invasion ecology are fundamentally connected and provide a common theoretical framework for studying the mechanisms underlying successful invasions and their ecological impacts. Temporal fluctuations in resource availability and differences in life-history traits between invasive and resident species are considered as likely drivers of the dynamics of invaded communities. Current critical issues in invasion ecology thus relate to the extent to which such mechanisms influence coexistence between invasive and resident species, and to the ability of resident species to persist in an invasive-dominated ecosystem. 2. We tested how a fluctuating resource and species traits differences may explain and help predict long-term impacts of biological invasions in forest specialist insect communities. We used a simple invasion system comprising closely related invasive and resident seed-specialized wasps (Hymenoptera: Torymidae) competing for a well-known fluctuating resource, and displaying divergent diapause, reproductive and phenological traits. 3. Based on extensive long-term field observations (1977-2010), we developed a combination of mechanistic and statistical models aiming to (i) obtain a realistic description of the population dynamics of these interacting species over time, and (ii) clarify the respective contributions of fluctuation-dependent and fluctuation-independent mechanisms to long-term impact of invasion on the population dynamics of the resident wasp species. 4. We showed that a fluctuation-dependent mechanism was unable to promote coexistence of the resident and invasive species. Earlier phenology of the invasive species was the main driver of invasion success, enabling the invader to exploit an empty niche. Phenology also had the greatest power to explain the long-term negative impact of the invasive on the resident species, through resource preemption. 5. This study provides strong support for the critical role of species differences in interspecific competition outcomes within animal communities. Our mechanisticstatistical approach allows disentangling the critical drivers of the dynamics of coexistence and exclusion within novel species assemblages, following both intentional and non-intentional species introductions.
Data from: Plant neighbours rather than soil biota determine impact of an alien plant invader
1. Various factors have been shown contributing to the ecosystem impact of invasive alien plants, but their relative importance remains unclear. We focused on the effects of neighbouring plant community and soil biota as these biotic factors have been repeatedly put forward to explain invasion success (e.g. as components of the novel weapons and of the biotic release hypothesis). 2. To assess their relative importance in explaining the high impact of Centaurea stoebe during the invasion of new sites in the introduced range, we conducted a greenhouse experiment with both European (EU) and North American (NA) tetraploid C. stoebe competing with/without EU vs. NA neighbouring community and with the two neighbouring communities growing without C. stoebe. Plants were grown in sterilized commercial soil inoculated with naïve soil (from rhizosphere of plants other than C. stoebe) originating either from the home EU or the introduced NA range and half of which was sterilized to remove soil biota. 3. In the competition pots, relative competitive ability (difference between the relative growth rates of C. stoebe and neighbouring community) and impact level (biomass of the neighbouring community relative to that in non-competition pots) of C. stoebe was significantly higher when grown with the NA than with the EU neighbouring community, although growth rates of EU and NA neighbouring communities did not differ in the non-competition pots. Both soil origin and C. stoebe origin had no effect on these processes. Soil sterilization increased growth of both C. stoebe and neighbouring communities, but had only a moderate effect on impact level and type, and no effect on the relative competitive ability of C. stoebe. 4. These results suggest that during the colonization of new sites in North American grasslands, the impact of C. stoebe is strongly driven by reduced competitive ability of NA neighbours compared with EU neighbours, while altered biotic soil conditions in the introduced range and post-introduction evolutionary changes in the invader are of less importance. This differential impact appears to be due to inherently different mechanisms underlying the competitive interactions between EU and NA neighbouring communities when grown with C. stoebe.
Data from: Seed and seedling traits have strong impacts on establishment of a perennial bunchgrass in invaded semi-arid systems
1. Many restoration projects use seeds to found new populations, and understanding phenotypic traits associated with seedling establishment in disturbed and invaded communities is important for restoration efforts worldwide. Focusing on the perennial grass Elymus elymoides, a native species common to sagebrush steppe communities in the Western United States, we asked if seed and seedling traits could predict field establishment. 2. We collected seeds from 34 populations from the western Great Basin. In greenhouse studies, we measured variation in seed and seedling characteristics of wild populations and one cultivar. We also quantified abiotic conditions at the collection location and asked if these characteristics predicted survival and other fitness metrics at five planting sites. Planting sites were all near-monocultures of the invasive annual grass Bromus tectorum, and all sites experienced similar, below-average precipitation during the experiment. 3. Phenotypic traits were strongly correlated with performance across all sites, with remarkably high predictive power. Seeds from populations with longer roots, larger seeds, and earlier emergence were significantly more likely to survive the first growing season (R2 = 0.66, P <0.0001). In contrast, while some abiotic variables at the collection location (e.g. 30 year average summer precipitation and fall minimum temperatures) were associated with field performance at some sites, abiotic variables explained less variation in performance than traits (average R2 = 0.22). Despite the low predictive power of abiotic variables, populations that performed best at each field site were from locations with climate variables similar to planting sites. 4. Synthesis and applications. The best seed sources for restoration of E. elymoides in invaded sites were populations with longer roots, larger seeds, and earlier emergence. These easily-measured traits were strong predictors of survival in disturbed field sites. While the most successful populations were found in areas with similar abiotic conditions as planting sites, there was phenotypic variation even among populations originating from locations with similar conditions. Thus, our results indicate that abiotic conditions are important considerations when selecting seeds, but these conditions may not sufficiently predict which populations will establish. Understanding population differences in seedling functional traits can improve predictions of restoration success.
Supplementary material 1 from: Amatangelo KL, Stevens L, Wilcox DA, Jackson ST, Sax DF (2018) Provenance of invaders has scale-dependent impacts in a changing wetland ecosystem. NeoBiota 40: 51-72. https://doi.org/10.3897/neobiota.40.28914
Supplementary material 1 from: Amatangelo KL, Stevens L, Wilcox DA, Jackson ST, Sax DF (2018) Provenance of invaders has scale-dependent impacts in a changing wetland ecosystem. NeoBiota 40: 51-72. https://doi.org/10.3897/neobiota.40.28914
Data from: Plant neighbours rather than soil biota determine impact of an alien plant invader
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Data from: Linking niche theory to ecological impacts of successful invaders: insights from resource fluctuation-specialist herbivore interactions
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Data from: Seed and seedling traits have strong impacts on establishment of a perennial bunchgrass in invaded semi-arid systems
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Data from: Climate change leads to increasing population density and impacts of a key island invader
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Data from: Non-random dispersal mediates invader impacts on the invertebrate community
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Data from: Do high-impact invaders have the strongest negative effects on abundant and functionally similar resident species?
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Allen Brain Atlas
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International Brain Laboratory public data
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OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.